Irwin Speedbor 5 in. Hardened Steel Self Feed Wood Bit Extension 7/16 in. 1 pc

Designed to deliver 3X longer life (on average compared to Irwin Speedbor self-feed bits) in challenging wood-drilling applications, with the 2-9/16-in Speedbor self-feed bits, even when driving into nail-embedded wood. Make quick, clean holes with durable, bi-metal construction engineered to withstand repeated nail strikes. The extended shank bit clears 4-in. thick dimensional lumber without needing an extension, while the included replacement tip avoids work interruptions. On the jobsite and tackle wood-drilling needs with ease.